Definitely 'Talk That Talk'! I feel a lot of people were let down after 'Loud' and 'We Found Love' but I've always loved it. Commercially I'd say 'ANTI' is probably her most underrated, definitely deserved to do better.

In terms of sales and peaks in the UK, definitely ANTI and Rated R. I feel like they're quite highly regarded though, so in terms of the album not appreciated enough it's definitely Talk That Talk for me! It's definitely my third favourite of hers after the first two I've mentioned and definitely seems underrated amongst the rest of her discography. So so many highlights.